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The search for a lead‐free, nontoxic, highly stable perovskite phase could end at the native oxide‐passivated composition of CsSn0.5Ge0.5I3. Mainly its remarkable stability is due to a thin native oxide layer (Sn‐doped GeO2) formation over CsSn0.5Ge0.5I3, which suppresses the Sn2+ oxidation to Sn+4. Herein, the performance of this mixed Sn–Ge perovskite and the role of native oxide is analyzed. The...
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